Love turbo

I just bought an 87 rx7 turbo. Previous owner said he replaced the turbo and couldn't get it to run right. Owner before him said it ran really good and pulled hard all the way to redline. The turbo blew so the guy I got it from replaced it. After a few days of messing with it I fixed the idle problem. One of the hoses were off the intake tube. So it idles good but doesn't seem to rev up like it should and has hardly any power when driving. Could the blown turbo have screwed up the apex seals? What should I look for. Thanks in advance